Brazilian billionaire Eike Batista (L), CEO of EBX Group, gestures next to Brazil's President Dilma Rousseff during a ceremony in celebration of the start of oil production of OGX, Batista's oil and gas company, at the Superport Industrial Complex of Acu in Sao Joao da Barra in Rio de Janeiro in this April 26, 2012 file photo. REUTERS/Ricardo Moraes/Files